Accession Number:

ADA275204

Title:

Relaxed Tolerance Following HSG (High Sustained +Gz)

Descriptive Note:

Interim rept. Nov 1992-Nov 1993

Corporate Author:

KRUG LIFE SCIENCES SAN ANTONIO TX SAN ANTONIO DIV

Personal Author(s):

Report Date:

1993-11-01

Pagination or Media Count:

5.0

Abstract:

INTRODUCTION. Changes in relaxed Gz tolerance impacts the support required from G protective measures and may affect the capability of the aircrew to reengage following exposure to HSG. During and post-HSG, simultaneous physiological events which could increase or decrease G-tolerance are activated. METHODS. This study exposed 6 male centrifuge subjects to a GORGradual Onset Rate 0.067 Gsecond acceleration to their subjective G-tolerance limit. Following a rest period, the subjects were exposed to a 7GZ ROR Rapid Onset Rate 1.0 Gsecond acceleration for 60 seconds. Immediately after the ROR the subjects were reexposed to the GOR and taken to their relaxed tolerance limit. RESULTS. The subjects relaxed tolerance on the first GOR pre-HSG was 5.4 Gz - 0.7 X - SD and their second GOR tolerance post-HSG was 4.5 - 0.6. Statistical significance via Students T Test 2 tailed was p0.065, but 5 of 6 subjects had a reduction in post-HSi tolerance. Electrocardiogram and heart rate evaluations provided an indicator of the cardiovascular response. CONCLUSIONS. This study suggests that relaxed Gz tolerance is lowered following a high G exposure. Such a post-HSG reduction in relaxed tolerance would place a greater burden on the pilots G protective systems thereby limiting ones ability to fully utilize the capability of the aircraft. R laxed tolerance, High sustained Gz, G-Tolerance.

Subject Categories:

  • Stress Physiology
  • Chemical, Biological and Radiological Warfare

Distribution Statement:

APPROVED FOR PUBLIC RELEASE